I have recently added a second Ethernet card into my Linux box to setup a
firewall between my internal network and our internet ISP. After some hoop
jumping with the tulip driver I have both Ethernet cards and drivers
working. (i.e. either one when configured with the appropriate IP
information can reach the internet) However, my problem arises when I have
the machines on the internal network just try to ping one another. None of
the machines on the internal network can ping any other machine on the
internal network. Here is my configuration.

My ISP connection comes in eth0 and I connect my eth1 to the hub. I then
have my other test boxes connected into the hub. None of the boxes can ping
one another.

If I reconfigure so that my ISP connection comes into my HUB and my Linux
box eth0 and other test boxes connect to the hub. And I set my test boxes to
the appropriate IP addresses then all boxes can see the internet; however, I
then cannot setup a firewall.

Any ideas on why none of the machines can ping one another on the local
internal network when configured as above?

Thanks,

Keith Bottner
kbottner@istation.com

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